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Browsing by Author "Chao, Ru-Pin"

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    Method of alignments of liquid crystal employing magnetic thin films
    (2010-05-06)
    Chao, Ru-Pin
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    Wu, Hsin-Ying
    Alignments of liquid crystal are obtained. A transparent magnetic thin film provides a homeotropic alignment of liquid crystal molecules. Or, a homeotropic or homogeneous alignment having an adjustable pretilt angle is further obtained through rubbing the transparent magnetic thin film. The present invention has a simple procedure with a low cost. The present invention is used in equipment with a plasma source while providing high transmittance, hardness and insulation. And the transparent magnetic thin film has potential uses in the applications of non-contact multi-domain alignment without extra procedure for alignment treatment.
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    Method of alignments of liquid crystal employing magnetic thin films
    (2009-03-26)
    Chao, Ru-Pin
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    Wu, Hsin-Ying
    Alignments of liquid crystal are obtained. A transparent magnetic thin film provides a homeotropic alignment of liquid crystal molecules. Or, a homeotropic or homogeneous alignment having an adjustable pretilt angle is further obtained through rubbing the transparent magnetic thin film. The present invention has a simple procedure with a low cost. The present invention is used in equipment with a plasma source while providing high transmittance, hardness and insulation. And the transparent magnetic thin film has potential uses in the applications of non-contact multi-domain alignment without extra procedure for alignment treatment.
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    Multi-wavelength external-cavity laser with digital and mode-hope-free fine tuning mechanisms
    (2005-03-10)
    Pan, Ci-Ling
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    Chao, Ru-Pin
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    Lan, Yu-Ping
    An apparatus for electronically tuning of a single or multi-wavelength external-cavity laser, comprising: an AR-coated diode laser, a collimator, a liquid crystal cell, a dispersion grating, a focusing lens and a liquid crystal pixel mirror. Wavelength channels can be selected by opening the appropriate pixels of the liquid crystal pixel mirror. By turning on several pixels at the same time, the laser can generate output at several wavelengths. Wavelength switching between channels is also possible. Laser wavelength can further be tuned by varying the driving voltages of the liquid crystal cell or the appropriate pixel mirror. The liquid crystal cell and the liquid crystal pixel mirror in the laser cavity can be combined to form a sandwich-type liquid crystal pixel mirror that allows both step (digital) or fine tuning of the laser wavelength.
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    Plasma device for liquid crystal alignment
    (2008-06-05)
    Chao, Ru-Pin
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    Wu, Hsin-Ying
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    Wang, Chih-Chieh
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    Chang, Shao-Ju
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    Hwang, Jenn-Chang
    A device utilizes a plasma for a liquid crystal alignment. The alignment is processed in a vacuum chamber in a simple way. A general chemical vapor deposition is coordinated to reduce cost. The present invention is a novel contactless process avoiding particle contamination, residual static charge and scratch. And multiple are as of the present invention can be used for alignment.
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    Terahertz phase shifter or retarder based on magnetically controlled birefringence in liquid crystals
    (2005-02-03)
    Pan, Ci-Ling
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    Chao, Ru-Pin
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    Chen, Chao-Yuan
    The present invention enables a means of continuously shifting the phase of electromagnetic waves in the THz (0.1 to 10 THz, 1 THz=10−12 Hz) or sub-millimeter wave range. It is based on magnetically controlled birefringence of liquid crystals. The device consists of an assembly of a liquid crystal cell and rotatable magnets. By varying the angle of the magnet with respect to the incident THz wave, desired phase shift or delay can be achieved. To increase the amount of phase shift, the device employs multiple liquid crystal cells in a compact sandwich structure.
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    TUNABLE TERAHERTZ WAVELENGTH SELECTOR DEVICE USING MAGNETICALLY CONTROLLED BIREFRINGENCE OF LIQUID CRYSTALS
    (2009-01-01)
    Chao, Ru-Pin
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    Pan, Ci-Ling
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    Chen, Chao-Yuan
    The present invention provides a tunable terahertz (THz) wavelength selector device, which includes a fixed phase retarder, a tunable phase retarder and a pair of linear polarizers to form a unit. The fixed phase retarder and tunable phase retarder basically utilizes liquid crystals to provide phase retardation, moreover, utilizing birefringence phenomenon possessed by liquid crystals can provide adequate phase retardation. The fixed phase retarder utilizes horizontal orientation of liquid crystal cell to provide fixed phase retardation, while the tunable phase retarder however utilizes homeotropic liquid crystal cell and a rotatable magnet to provide a tunable phase retardation, wherein the tunable phase retarder can provide the positive or negative phase retardation relative to the fixed phase retarder, based on the direction of the magnet's rotating axes and totally use the entire tunable range into adjusting frequencies which can pass through. Besides, the present invention can also serially connect multiple units described above so as to achieve a narrow enough band-pass bandwidth.